代码来源于《Go语言开发教程》

// 线程同步: sync.Mutexpackage mainimport ("errors""fmt""sync"
)type MyMap struct {mp    map[string]intmutex *sync.Mutex
}func (this *MyMap) Get(key string) (int, error) {this.mutex.Lock()i, ok := this.mp[key]this.mutex.Unlock()if !ok {return i, errors.New("not exist")}return i, nil
}func (this *MyMap) Set(key string, v int) {this.mutex.Lock()defer this.mutex.Unlock()this.mp[key] = v
}func SetValue(m *MyMap) {var a runea = 'a'for i := 0; i < 10; i++ {m.Set(string(a+rune(i)), i)}
}func (this *MyMap) Display() {this.mutex.Lock()defer this.mutex.Unlock()for k, v := range this.mp {fmt.Println(k, "=", v)}
}func main() {m := &MyMap{mp: make(map[string]int), mutex: new(sync.Mutex)}go SetValue(m)go m.Display()var str stringfmt.Scan(&str)
}